Acer at3705 schematic

AT3705

Service Guide

Service guide files and updates are available on the AIPG/CSD web; for more information,

please refer to http://csd.acer.com.tw

PRINTED IN TAIWAN

Revision History

Please refer to the table below for the updates made on AT3705 service guide.

Date Chapter Updates

II

Copyright

Copyright © 2005 by Acer Incorporated. All rights reserved. No part of this publication may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language or computer language, in any form or by any means, electronic, mechanical, magnetic, optical, chemical, manual or otherwise, without the prior written permission of Acer Incorporated.

Disclaimer

The information in this guide is subject to change without notice.

Acer Incorporated makes no representations or warranties, either expressed or implied, with respect to the contents hereof and specifically disclaims any warranties of merchantability or fitness for any particular purpose. Any Acer Incorporated software described in this manual is sold or licensed "as is". Should the programs prove defective following their purchase, the buyer (and not Acer Incorporated, its distributor, or its dealer) assumes the entire cost of all necessary servicing, repair, and any incidental or consequential damages resulting from any defect in the software.

Acer is a registered trademark of Acer Corporation. Intel is a registered trademark of Intel Corporation. Other brand and product names are trademarks and/or registered trademarks of their respective holders.

III

Conventions

The following conventions are used in this manual:

Screen messages

NOTE Gives bits and pieces of additional

WARNING Alerts you to any damage that might

CAUTION Gives precautionary measures to

IMPORTANT Reminds you to do specific actions

Denotes actual messages that appear on screen.

information related to the current topic.

result from doing or not doing specific actions.

avoid possible hardware or software problems.

relevant to the accomplishment of procedures.

IV

Preface

Before using this information and the product it supports, please read the following general information.

1. This Service Guide provides you with all technical information relating to the BASIC CONFIGURATION decided for Acer's "global" product offering. To better fit local market requirements and enhance product competitiveness, your regional office MAY have decided to extend the functionality of a machine (e.g. add-on card, modem, or extra memory capability). These LOCALIZED FEATURES will NOT be covered in this generic service guide. In such cases, please contact your regional offices or the responsible personnel/channel to provide you with further technical details.

2. Please note WHEN ORDERING FRU PARTS, that you should check the most up-to-date information available on your regional web or channel. If, for whatever reason, a part number change is made, it will not be noted in the printed Service Guide. For ACER-AUTHORIZED SERVICE PROVIDERS, your Acer office may have a DIFFERENT part number code to those given in the FRU list of this printed Service Guide. You MUST use the list provided by your regional Acer office to order FRU parts for repair and service of customer machines.

V

Chapter1 System Specifications ...............................................1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Chapter3 Machine Disassembly and Replacement ............32

General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Disassembly Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Chapter 4 Troubleshooting.........................................................50

Chapter 6 FRU (Field Replaceable Unit) List .........................94

Exploded Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

FRU List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

1

System Specifications

Introduction

This chapter describes the product specification for the LCD TV AT3705

Model AT3705-MGW AT3705-DTV

Panel spec

Panel manufacturer CMO CMO

Panel model name V370H1-L01 V370H1-L01

Technology Super MVA Super MVA

Resolution 1920x1080 1920x1080

Brightness (typ.) 550 nits 550 nits

Contrast Ratio (typ.) 800:1 800:1

Display color 16.7 M 16.7 M

Viewing Angle (typ.) H:176 ; V:176 H:176 ; V:176

Response Time (typ.) 12 ms (Gray to Gray) 12 ms (Gray to Gray)

Power Supply

Input 100V~240V-AC. 100V~240V-AC.

Max.Power Consumption 280W 280W

Power Saving 5W 5W

Mechanical

Dimensions (WxHxD mm) 1018 (L) x 616 (H) x 210 (W) mm1018 (L) x 616 (H) x 210 (W)

mm

Weight (Kg) 36.0 36.0

Weight (lb) 79.3 79.3

Gross Weight (Kg) 42 42

Gross Weight (lb) 92.6 92.6

Wall Mounting 400mm x 200mm 400mm x 200mm

Mechanical

Dimensions (WxHxDmm) 1185 x 724 x 285 1185 x 724 x 285

Weight (Kg) 36.0 kg 36.0 kg

Weight (lb) 79.3 lb 79.3 lb

Gross Weight (Kg) 42kg 42kg

Gross Weight (lb) 92.6 lb 92.6 lb

Wall Mounting 400mm x 200mm 400mm x 200mm

Analog TV system

TV Color system NTSC NTSC

Sound system M M

Stereo system BTSC/ A2 BTSC/ A2

Analog TV Tuner quantity 1 1

Digital TV system

Digital TV Standard DVB-T DVB-T

Sound system

Chapter 1

Chapter 1 1

Model AT3705-MGW AT3705-DTV

ISO11172-3 layer1 & layer2

32KHz,44.1KHz,48KHz

Stereo system Dolby AC3 / PCM / MPEG (

Layer I & II ) Stereo 32 / 44.1 / 48KHz

SPDIF 2/4/6 Channel 2/4/6 Channel

Te le t ex t Ye s Yes

Subtitle Yes Yes

EPG 7days EPG 7days EPG

Frequency 6 MHz 6 MHz

Video format 16bit YUV 16bit YUV

Resolution SD(480i) SD(480i)

Digital TV Tuner quantity 1 1

Audio system

Speaker 15W+15W 15W+15W

Audio Enhancement "BBE, SRS WOW" "BBE, SRS WOW"

Digital Audio Dolby Digital Dolby Digital

Ter min al

Analog Tuner In Yes Yes

Digital Tuner In Yes Yes

Component1(HD) in "YPbPr/YCbCr,Audio R/L" "YPbPr/YCbCr,Audio R/L"

Component2(HD) in "YPbPr/YCbCr,Audio R/L" "YPbPr/YCbCr,Audio R/L"

Component3(HD) in "YPbPr/YCbCr,Audio R/L" "YPbPr/YCbCr,Audio R/L"

AV1 in "CVBS, S Video, Audio R/L" "CVBS, S Video, Audio R/L"

AV2 in "CVBS, S Video, Audio R/L" "CVBS, S Video, Audio R/L"

AV3 in "CVBS, S Video, Audio R/L" "CVBS, S Video, Audio R/L"

AV4 in "CVBS, S Video, Audio R/L" "CVBS, S Video, Audio R/L"

AV5 in "CVBS, Audio R/L" "CVBS, Audio R/L"

AV out "Analogy TV-CVBS out, Audio

R/L"

SPDIF out Yes Yes

DVI-D in yes (with HDCP) yes (with HDCP)

HDMI in yes (with HDCP) yes (with HDCP)

PC D-sub in Yes Yes

PC Audio in Yes Yes

Headphone out Yes Yes

RJ45 in Yes NA

Media Gateway

Card Reader "CF, MMC, MS, MS PRO, SD," NA

Audio "LPCM, MP3, WMA7/8/9,

WAV"

Video "MPEG1/2/4, DivX, XViD,

WMV9, Quicktime (*.mp4);"

Video(HD) "MPEG2 (up to 1080i), MPEG4

(720p), WMV9 (720p)"

Photo "JPEG, TIFF, BMP, GIF, PNG" NA

Playlist "M3U, PLS" NA

ISO11172-3 layer1 & layer2

32KHz,44.1KHz,48KHz

Dolby AC3 / PCM / MPEG ( Layer I & II ) Stereo 32 / 44.1 / 48KHz

"Analogy TV-CVBS out, Audio R/L"

NA

2 Chapter 1

Model AT3705-MGW AT3705-DTV

On-line media Live365 NA

Compliance "UPnP compliant, INMPR

compliant, DLNA"

Operating system Linux NA

Networking (WLAN) 802.11b/g: 11/54Mbps NA

Networking (Fast Ethernet) 10/100Mbps NA

NA

Chapter 1 3

Abbreviations / symbols

The main abbreviations used in this document are listed below with their meanings:

CCIR International Radio consultative committee

CVBS Composite Video Baseband Signal

dBm dB milliWatt dBµV dB microVolt

DAR Display Aspect Ratio

DV Digital Video

DVI Digital Video Interface

ESD Electro Static Discharges

FP Front panel keypad

IC Integrated Circuit

IF Intermediate Frequency

IR Infra Red

KP Keypad

MN Menu

MTBF Mean Time Between Failure

OIRT International Radio and Television Organization

OSD On Screen Display

PLL Phase Locked Loop

PIP Picture-in-Picture

PAP Picture And Picture

RC Remote Control

RF Radio Frequency

RGB Video Components : Red / Green / Blue

SCART 21 pins SCART plug

SWR Standing Wave Ratio

TBD To Be Defined

TV Television Set

VBI Vertical Blanking Interval

VCR Video Cassette Recorder

VESA Video Electronics Standard Association

VGA Video Graphics Array

VHF/ UHF Very High Frequency / Ultra High Frequency

Y/C S-Video signals : Luminance / Chrominance

YprPb Video Components : Luminance / R-Y / B-Y

FB Fast Blanking

SB Slow Blanking

USB Universal Serial Bus

HDMI High-definition multimedia interface

HDCP High bandwidth digital content protection

ELECTRO / OPTICAL

1) Size of screen 37 inches

2) LCD Panel supplier CMO, AUO

3) Screen aspect ratio 16:9

4) Type of screen TFT with Super MVA technology or SIPS or QSV.

5) Screen resolution 1920 x 1080

6) Display colors 16.7 M colors ( 8 real bits per color )

7) Chromaticity Red 0.646 0.332

Green 0.269 0.600

Blue 0.142 0.072

White 0.285 0.293

(data from CMO panel specification)

8) Color temperature:

Five modes are adjustable,

Cold 16,000 degree K

Middle-cold 14,000 degree K

Standard 12,000 degree K

Middle-warm 10,000 degree K

Warm 8,000 degree K

9) White uniformity ± 5% of the white average color temperature at 100% luminance

10) White dispersion ± 5% of the white color temperature desired at 100% luminance

11) Brightness 500 Cd/m

2

(typical)

12) Contrast 450 :1 (typical)

13) Uniformity ≥ 85 % (white and color uniformity measured on 9 points)

14) Overscan video source is with overscan supported

graphic source is without overscan supported

15) Vision angle ultra wide viewing angle: 176(H),176(V) (CR>20)

16) Gamma the gamma value (global value ) must be between 2.2 and 2.6 measured from

DVI

17) Response time (T

/ TF) ≤ 16ms (data is provided from CMO panel specification)

R

18) Screen (lamp + LCD) life > 50,000 hrs at nominal backlight intensity

19) CCFL backlight 20

20) Panel interface 2-ch LVDS

MAINS

1) Power Supply Electrical Specifications

The power supply for this product is an internal converter, with a

non-replaceable fuse internally. This converter is designed to meet CE mark

requirement.

Input Voltage and Frequency Range

The operating range of line voltage is:

AC 90volts to 264volts, 47HZ to 63HZ

Power comsuption is under 280Watts

Line Fuse

The AC input is fused and becomes electrically open as a result of an

unsafe current condition. This fuse is inside the power supply converter

and is not user replaceable, and must be returned for replacement.

This fuse is well selected to handle inrush current for all combinations of

line voltage and frequency.

2) Standby consumption < 5 W

3) Power consumption < 280 W

4) Mains disturbance behavior no disjunction during 0 to 40ms mains interrupt, with

max load, min mains voltage

No software reboot during the test.

No over voltage causing any damage during mains interrupt (0 to

any time )

5) Inverter The inverter which is used to light up back-light of LCD panel is well designed to

meet requirement of panel’s specification.

ACOUSTICAL / AUDIO

1) Audio power amplifier 2 x 12W rms on 8ohm load impedance.

2) Loudspeakers Attachable ,( 1 x full range + 1 x sub-woofer speakers ) x 2

3) Loudspeaker performances Max. Audio output ( at 10% THD max. ) at 1.0Vp-p / 1kHZ input : 15W +15W

Sound Distortion at 1W/1kHZ : 1% THD max.

Speaker : Two of 15W

Speaker impedance : 8 ohms at 1kHZ

Residual Hum at Min. Volume : 500uW Max.

Max. Hum at Max. Volume : 1000uW Max.

4) Analog TV Audio modes AM/FM mono, stereo, sound1, sound2.

5) Audio Enhancement Stereo

SRS WOW

BBE

* audio enhancements effect is audible at 5M in front of the screen

6) Acoustical noise ( completeTV) audible noise in standby mode < 35dBA (ISO-7779)

audible noise in power ON mode < 35dBA (ISO-7779)

parasitic noise due to mechanical vibration during audio sweep

must be inaudible at 1m around the TV .

HARD / SOFT PERFORMANCES

1) Supported Languages Czech, Danish, Dutch, English, French, German, Italian, Polish, Portuguese,

Russian, Spanish, Swedish

2) Starting time A correct picture (color, aspect ratio, stability) can be displayed

< 6 sec after Power ON

3) Wake-up behavior The system can be waken up if the button Standby is pressed (keypad ‘power’ or

remote control ‘power’, ‘0~9’, ‘CH+/-‘)

4) Stand-by reason The TV pass in standby mode upon :

• The button ‘power’ is pressed (keypad or remote control)

• On the selected source: no sync signal after 8 mins.

5) Analog tuner performances

No. PARAMETER MIN TYP MAX UNIT NOTE

1 Video output level 0.7 1.0 1.3 Vp-p

2 Video S/N 40 45 --- dB

3 Noise limiting --- 38 45 dbuV

4

Video frequency

characteristics

2Mhz 0.0 -1.5 dB

3Mhz -0.5 -2.5 dB

3.58Mhz -1.0 -4.0 dB

5 Audio output level 0.350 0.450 0.550 Vrms

6 Audio S/N 50 63 --- dB

7 Frequency Range 48.25 863.25 MHZ

Note : data is provided from tuner specification

6) DVBT module management Ref to AD6 module specification

7) Scanning mode Automatic: Multistandard, frequency based

Manual : Frequency setting is available.

8) Analog TV Naming function Automatic : CNI recognition

Manual : 5 Characters

9) PIP/POP/PBP function PIP

PIP multiple size 20%, 30%

PIP multiple position 4 corners

POP

POP source video/graphic(main) by ATV(sub)

POP(main + sub) 1+5 , 1+12

In PIP/POP/PBP mode, de-interlacer does not support to 1080i.

PIP/PBP

1. Support Video by Video

2. Support Video by Graphic (support Graphic signal up to 1080i and No

deinterlacer in 1080i)

3. No Auto SCART is supported

4. VGA and DVI can only support up to 1024x768@60Hz

Note

z Video includes: ATV, SCART1-4 (CVBS and S-Video), AV1, AV2

and DTV.

z Graphic includes: component1, component2, MGW/CardReader,

VGA, DVI and HDMI.

TV

SCART1

SCART2

SCART3

SCART4

Component 1

Component 2

AV1

AV2

DTV

MGW /Card

VGA

DVI

Main

Sub

HDMI

Q Q Q Q Q Q Q Q Q Q Q Q Q

TV

SCART1

SCART2

SCART3

SCART4

Component 1

Component 2

U

Q U

Q Q

U

Q Q Q Q Q Q Q Q Q Q Q Q

U Q Q Q Q Q Q Q Q Q Q Q

Q U Q Q Q Q Q Q Q Q Q Q

Q Q U Q Q Q Q Q Q Q Q Q

U U U U U U U U U U U U U

AV1

AV2

DTV

MGW/Card

VGA

DVI

HDMI

Q Q Q Q Q Q Q U

Q Q Q Q Q Q Q Q U

Q Q Q Q Q Q Q Q Q U

U U U U U U U U U U U U U

U

Q Q Q Q Q U

U Q Q Q U U U U

Q Q Q Q Q Q

Q Q Q Q Q

Q Q Q Q

(table of PIP & PBP)

POP:

1. POP sub window only support Analog TV

2. No Auto SCART supported in POP mode

3. In POP12 Mode, support Component 1, 2 (up to 1080i) and MGW/Card

Reader (up to 1080i), VGA/DVI (up to 1024x768@60Hz) and HDMI (up

to 1080i)

4. In POP5 Mode, No MGW/Card Reader, VGA, DVI and HDMI supported

5. Component 1, 2 can support up to 720P in POP5 mode

1

.

2

.

TV

SCART1

SCART2

SCART3

SCART4

Component 1

Component 2

AV1

AV2

DTV

MGW/Card

VGA

DVI

Main

Sub

HDMI

TV

SCART1

SCART2

SCART3

SCART4

1

U Q Q Q Q

U U U U U U U U U U U U U U

Q1Q

Q Q Q

2

Q

Q2 Q2 Q

2

Component 1

Component 2

AV1

AV2

DTV

MGW/Card

VGA

DVI

HDMI

U U U U U U U U U U U U U U

U U

U U U U U U U U U U U U U U

U U U U U U U U U U U U

U U U U U U U U U U U U U U

(table of POP)

10) TTX Level FLOF level 1.5. Source can be RF, DVBT or AV.

TTX characters set must follow the country language selection.

11) TTX keys function Full screen, Subtitle, Hold, Size, 4 Color keys (R, G, Y, B)

12) Video standard supported PAL, SECAM (automatic detection)

PAL (4.43 M, 50 Hz) B、G、D、K、H、I

SECAM L

13) Video ADC and processing 10 bits (chroma and luma)

Luma / chroma AGC,

10 bits processing,

Noise reduction,

Chroma transcient improvement,

Luma transcient improvement,

3D Comb filter,

De-interlacer.

14) Time to synchronize during a source / channel change, within 4 sec to obtain a stable

Display

15) Video management User adjustments: Contrast, Brightness, Color, Tint (NTSC),

Sharpness

Color Temperature: cold, middle-cold, Standard, middle-warm, warm

16) Aspect ratio Aspect ratio available for all the video sources.

4/3, 16/9, panorama, letterbox1, letterbox2, letterbox3.

Note: PC & DVI only support 4/3 & 16/9

17) Scenario functions Settings: Standard, movie, sport, concert, game, user

Noise reduction: Off, Low, Middle, High

18) Audio management User adjustments: Volume, Balance, Bass, Treble,

MUTE, MONO/STEREO/Sound1/Sound2

19) Audio enhancement Stereo, SRS WOW, BBE

20) AV sub-format supported CVBS, YC, RGB, YUV

21) Copy protection management HDCP (HDMI)

22) MGW module Ref to Alpha MGW’s specification

23) Card reader function Ref to Alpha MGW’s specification

24) IR performances The reception distance indicate the distance between IR emitter

and receptor which allow to recognize 85% or more IR frames.

Reception distance : > 7.5 M perpendicular to the IR sensor

> 5 M at 45° horizontally

> 5 M at 45° vertically

7.5M in front of the IR sensor

X axis ± 45 ° at 5m

Y axis ± 45 ° at 5m